A few of the site features are not working right now. The ability to search for your own posts in order seems to be one of them.
Up by "Welcome back" your nickname appears. Click on that & then "posts by" & your posts will appear, when the search is working again.
In the meantime you can put your name in the regular search box & click on "community". Some posts may come up. It will take time. Says "done" when the page is still blank.
Most people simply save a few posts in their favorites & delete when no longer needed. It works for a day or two.